Perished hose on intake manifold / boost leak

I'm 99% I've got a boost leak - I can hear the turbo spinning quite loudly but it's not translating into much extra power!

I've rummaged around and the only perished hose I can find is the one on the top right of the intake manifold which I can't really figure out what it's doing - it runs off a few places out of sight! Any ideas what it does and if it would be having an impact?

I've seen another thread (which I now can't find) which suggested this could be due to the N112, however I've not been able to check that yet - helpfully the screws holding the plastic trim onto the plate it's mounted under have been rounded off so I'll be drilling them out at the weekend!

Will do - any recommendations for somewhere that can smoke test around Guildford - there's a serious lack of decent VAG specialists around here!

The hose in question is crimped into a metal pipe to go over the engine then converts back to rubber - presumably an expensive dealer part so is there any reason I can't replace with a single piece of silicone hose (teed as necessary - I forget the routing).

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